:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-soft: #f8fafc;
    --text: #172033;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #15803d;
    --success-soft: #dcfce7;
    --danger: #dc2626;
    --danger-soft: #fee2e2;
    --warning: #b45309;
    --warning-soft: #fef3c7;
    --sidebar: #111827;
    --sidebar-muted: #9ca3af;
    --radius: 14px;
    --shadow: 0 12px 30px rgba(15, 23, 42, .06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.5;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.app-shell { min-height: 100vh; }
.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: 250px;
    background: var(--sidebar);
    color: #fff;
    display: flex;
    flex-direction: column;
    z-index: 50;
    transition: transform .25s ease;
}
.brand {
    min-height: 82px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 20px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.brand-mark {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    font-weight: 800;
    background: var(--primary);
}
.brand strong, .brand small { display: block; }
.brand small { color: var(--sidebar-muted); font-size: 12px; }
.sidebar-nav { padding: 18px 12px; flex: 1; }
.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 13px;
    margin-bottom: 5px;
    color: #d1d5db;
    border-radius: 10px;
    transition: .2s ease;
}
.nav-link:hover, .nav-link.active { color: #fff; background: rgba(255,255,255,.1); }
.nav-link.active { box-shadow: inset 3px 0 0 var(--primary); }
.nav-link.danger:hover { background: rgba(220,38,38,.18); }
.nav-icon { width: 22px; text-align: center; font-size: 18px; }
.sidebar-footer { padding: 12px; border-top: 1px solid rgba(255,255,255,.08); }

.main-shell { margin-left: 250px; min-height: 100vh; display: flex; flex-direction: column; }
.topbar {
    min-height: 82px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 14px 28px;
    position: sticky;
    top: 0;
    z-index: 40;
}
.sidebar-toggle { display: none; border: 0; background: transparent; font-size: 24px; }
.topbar-title { flex: 1; }
.topbar-title h1 { margin: 0; font-size: 22px; }
.topbar-title p { margin: 2px 0 0; color: var(--muted); font-size: 13px; }
.topbar-actions { display: flex; align-items: center; gap: 14px; }
.user-chip { display: flex; align-items: center; gap: 9px; }
.avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: #dbeafe;
    color: var(--primary-dark);
    font-weight: 800;
}
.user-chip-text strong, .user-chip-text small { display: block; }
.user-chip-text small { color: var(--muted); font-size: 11px; }
.content { flex: 1; padding: 28px; }
.footer {
    padding: 18px 28px;
    display: flex;
    justify-content: space-between;
    color: var(--muted);
    font-size: 13px;
    border-top: 1px solid var(--border);
    background: var(--surface);
}

.grid { display: grid; gap: 20px; }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.card-header {
    padding: 18px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.card-header h2, .card-header h3 { margin: 0; font-size: 17px; }
.card-body { padding: 20px; }
.stat-card { padding: 20px; }
.stat-label { color: var(--muted); font-size: 13px; }
.stat-value { font-size: 24px; font-weight: 800; margin-top: 8px; }
.stat-note { margin-top: 8px; font-size: 12px; color: var(--muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-muted { color: var(--muted); }

.page-actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 18px; }
.page-actions p { margin: 0; color: var(--muted); }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    border: 1px solid transparent;
    border-radius: 9px;
    padding: 10px 15px;
    font-weight: 700;
    line-height: 1.2;
}
.btn-sm { padding: 8px 11px; font-size: 13px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--surface); border-color: var(--border); color: var(--text); }
.btn-secondary:hover { background: var(--surface-soft); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger-outline { border-color: #fecaca; color: var(--danger); background: #fff; }
.btn-success { background: var(--success); color: #fff; }

.form-group { margin-bottom: 16px; }
.form-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
label { display: block; font-weight: 700; font-size: 13px; margin-bottom: 7px; }
.form-control {
    width: 100%;
    border: 1px solid #d1d5db;
    border-radius: 9px;
    padding: 10px 12px;
    color: var(--text);
    background: #fff;
    outline: none;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
textarea.form-control { min-height: 95px; resize: vertical; }
.help-text { color: var(--muted); font-size: 12px; margin-top: 5px; }
.form-actions { display: flex; gap: 10px; margin-top: 22px; }

.table-responsive { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 13px 15px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); background: var(--surface-soft); }
td { font-size: 14px; }
tr:last-child td { border-bottom: 0; }
.table-actions { display: flex; align-items: center; gap: 7px; }
.badge { display: inline-flex; align-items: center; border-radius: 999px; padding: 4px 9px; font-size: 11px; font-weight: 800; }
.badge-income, .badge-success { color: var(--success); background: var(--success-soft); }
.badge-expense, .badge-danger { color: var(--danger); background: var(--danger-soft); }
.badge-transfer, .badge-warning { color: var(--warning); background: var(--warning-soft); }
.badge-neutral { color: #475569; background: #e2e8f0; }

.alert { padding: 13px 15px; border-radius: 10px; margin-bottom: 18px; font-weight: 600; }
.alert-success { background: var(--success-soft); color: var(--success); border: 1px solid #bbf7d0; }
.alert-error { background: var(--danger-soft); color: var(--danger); border: 1px solid #fecaca; }
.alert-warning { background: var(--warning-soft); color: var(--warning); border: 1px solid #fde68a; }
.empty-state { text-align: center; padding: 45px 20px; color: var(--muted); }
.empty-state strong { display: block; color: var(--text); margin-bottom: 6px; }

.progress { height: 9px; background: #e5e7eb; border-radius: 999px; overflow: hidden; }
.progress-bar { height: 100%; background: var(--primary); border-radius: inherit; }
.progress-bar.warning { background: #f59e0b; }
.progress-bar.danger { background: var(--danger); }
.budget-item { margin-bottom: 20px; }
.budget-head { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 7px; font-size: 13px; }

.bar-chart { display: flex; align-items: end; gap: 12px; height: 220px; padding-top: 20px; }
.bar-group { flex: 1; min-width: 40px; text-align: center; }
.bar-stack { height: 170px; display: flex; align-items: end; justify-content: center; gap: 4px; }
.bar { width: 18px; min-height: 2px; border-radius: 5px 5px 0 0; }
.bar.income { background: #22c55e; }
.bar.expense { background: #ef4444; }
.bar-label { margin-top: 8px; font-size: 11px; color: var(--muted); }
.legend { display: flex; gap: 15px; font-size: 12px; color: var(--muted); }
.legend span::before { content: ''; display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 5px; }
.legend .income::before { background: #22c55e; }
.legend .expense::before { background: #ef4444; }

.filter-bar { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; align-items: end; }
.account-list { display: grid; gap: 12px; }
.account-item { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 13px 0; border-bottom: 1px solid var(--border); }
.account-item:last-child { border-bottom: 0; }
.account-item small { display: block; color: var(--muted); }

.auth-page { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: linear-gradient(135deg, #eff6ff, #f8fafc 45%, #eef2ff); }
.auth-card { width: 100%; max-width: 430px; background: #fff; border: 1px solid var(--border); border-radius: 18px; box-shadow: 0 24px 60px rgba(15,23,42,.12); padding: 30px; }
.auth-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
.auth-brand h1 { margin: 0; font-size: 22px; }
.auth-brand p { margin: 2px 0 0; color: var(--muted); font-size: 13px; }
.auth-title { margin: 0 0 6px; }
.auth-subtitle { margin: 0 0 22px; color: var(--muted); }
.auth-footer { margin-top: 20px; text-align: center; color: var(--muted); font-size: 13px; }
.auth-footer a { color: var(--primary); font-weight: 700; }

@media (max-width: 1100px) {
    .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .filter-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
    .sidebar { transform: translateX(-100%); box-shadow: 14px 0 40px rgba(15,23,42,.25); }
    .sidebar.open { transform: translateX(0); }
    .main-shell { margin-left: 0; }
    .sidebar-toggle { display: block; }
    .user-chip-text { display: none; }
}
@media (max-width: 680px) {
    .content { padding: 18px; }
    .topbar { padding: 12px 18px; }
    .topbar-title p, .topbar-actions .btn { display: none; }
    .grid-4, .grid-3, .grid-2, .form-row, .filter-bar { grid-template-columns: 1fr; }
    .page-actions { align-items: flex-start; flex-direction: column; }
    .footer { padding: 16px 18px; }
    .footer span:last-child { display: none; }
}